A roll film cutting machine and method of using the same

Abstract

This invention discloses a roll film cutting machine and its usage method, including a frame, a moving device, a cutting device, a spacing calibration device, and a control module. The moving device, cutting device, and spacing calibration device are respectively connected to the control module. The moving device includes a horizontal movement mechanism and a vertical movement mechanism. The horizontal movement mechanism and the spacing calibration device are fixed to the frame. The cutting device is fixed to the vertical movement mechanism. The frame carries the film assembly. The cutting device includes a cutting blade. The spacing calibration device includes a camera and an image processing module. This invention accurately controls the film cutting thickness of the cutting device through the spacing calibration device and realizes automatic film cutting. At the same time, it monitors the length of the cuts at both ends of the film and realizes automatic alignment, effectively improving the film cutting quality and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of roll material processing technology, and relates to a roll film cutting machine and its usage method. Background Technology

[0002] Roll film cutting machines are used for cutting roll materials. Existing roll film cutting machines require manual observation of the cutting progress. When the cut is complete, the machine is manually stopped. During this process, the degree of cutting of the roll material depends entirely on manual observation, which is greatly affected by human factors. If the person leaves the workstation, it is easy to over-cut. If the person lacks experience, the cut film thickness may be insufficient, leading to repeated cutting. In addition, when the roll material is long, due to cutting vibration or installation accuracy issues, the cutting length at both ends of the roll material is prone to deviation as the cutting time increases, which seriously affects the cutting efficiency of the roll material. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a roll film cutting machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a roll film cutting machine, comprising a frame, a moving device, a cutting device, a spacing calibration device, and a control module. The moving device, the cutting device, and the spacing calibration device are respectively connected to the control module. The moving device includes a transverse movement mechanism and a longitudinal movement mechanism. The transverse movement mechanism and the spacing calibration device are fixedly mounted on the frame. The cutting device is fixedly mounted on the longitudinal movement mechanism. The frame carries the film assembly. The cutting device includes a cutting blade. The spacing calibration device includes a camera and an image processing module.

[0005] Furthermore, the frame includes a support, a first connecting frame, and a second connecting frame. Two sets of supports are symmetrically arranged. The first and second connecting frames are located between the two sets of supports and are fixedly connected to the supports. The film assembly includes a film roller and a film. The film to be cut is wound around the film roller, and both ends of the film roller are respectively mounted on the supports. Furthermore, the moving device includes a transverse mechanism and a longitudinal mechanism. The transverse mechanism is fixed between the two sets of supports, and the longitudinal mechanism is fixed to the transverse mechanism. The transverse mechanism includes a transverse motor and a transverse frame. Both ends of the transverse frame are fixedly connected to the two sets of supports. A transverse lead screw is rotatably mounted inside the transverse frame, and a transverse slider is connected to the transverse lead screw. The transverse slider is slidably connected to the transverse frame. The transverse motor is fixed to any one of the supports and connected to any one end of the transverse lead screw.

[0006] Furthermore, the longitudinal movement mechanism includes a longitudinal movement motor and a longitudinal movement frame. The longitudinal movement frame is fixedly mounted on the transverse movement slider. A longitudinal movement screw is rotatably mounted inside the longitudinal movement frame. A cutting bracket is connected to the longitudinal movement screw. The cutting bracket is fixedly connected to the cutting device and slidably connected to the longitudinal movement frame. The longitudinal movement motor is fixedly mounted on the longitudinal movement frame and connected to the longitudinal movement screw.

[0007] Furthermore, the cutting device includes a cutting motor, which is fixed to the cutting bracket via a cutting blade bracket. The output shaft of the cutting motor is fixed with a cutting blade, and a protective cover is provided on the cutting blade bracket.

[0008] Furthermore, two sets of cameras are provided, located at both ends of the thin film assembly. The cameras at both ends are fixed to the brackets by camera brackets, and the image acquisition direction of the cameras faces the thin film assembly. The cameras are connected to the image processing module, which has built-in image processing algorithms. The image processing module is connected to the control module, and the horizontal movement mechanism, the vertical movement mechanism, and the cutting device are respectively connected to the control module. The cameras acquire images and transmit the acquired images to the image processing module. The image processing module processes the received images and transmits the processing results to the control module. The control module controls the opening and closing of the horizontal movement mechanism, the vertical movement mechanism, and the cutting device according to the processing results.

[0009] Furthermore, it also includes wheels, which are mounted on the frame.

[0010] A method of using a roll film cutting machine includes the following steps:

[0011] Step 1: Initialize the roll film cutting machine and confirm the status of the moving device, cutting device, spacing calibration device, and control module;

[0012] Step 2: The film assembly is installed on the frame, and the clamping mechanism secures the film assembly to the frame;

[0013] Step 3: The transverse mechanism moves the longitudinal mechanism and the cutting device installed on the longitudinal mechanism to the first cutting position, and the longitudinal mechanism is activated to move the cutting device to the position to be cut;

[0014] Step 4: The cutting device is activated to cut the roll of film along the axial direction of the film assembly;

[0015] Step 5: The camera captures images and transmits them to the image processing module for processing;

[0016] Step 6: Determine whether the cut lengths at both ends of the film are aligned based on the image processing data from Step 5. If yes, proceed to Step 4. If no, the cutting device stops cutting, the longitudinal movement mechanism controls the cutting blade to step forward, and Step 5 is executed. Repeat this process multiple times to complete the alignment and cutting adjustment.

[0017] Step 7: Based on the image processing data from Step 5, determine whether the distance between the cut position and the film roller is less than the threshold. If yes, the film roll is cut in place, the cutting device stops running, the transverse mechanism, longitudinal mechanism and cutting device are reset, the clamping mechanism is started and reset, the film assembly is removed from the frame and placed in the storage area, the step ends, and one film roll is completed. If no, the longitudinal mechanism will move the cutting piece toward the film direction and execute Step 4.

[0018] Furthermore, step 5, in which the image processing module processes the image, includes the following steps:

[0019] Step 5.1: Establish an image coordinate system, extract the thin film roller region, and set the thin film roller region as G;

[0020] Step 5.2: Based on G obtained in Step 5.1, obtain the edge of the film roller and perform circle fitting to obtain the center coordinates (Gx, Gy) and radius Gr of the film roller.

[0021] Step 5.3: Extract the thin film region, and set the thin film region as S;

[0022] Step 5.4: Based on S obtained in Step 5.3, obtain the edge of the film and perform circle fitting to obtain the center coordinates (Sx and Sy) and radius Sr of the film.

[0023] Step 5.5: Based on the data obtained in Step 5.4, obtain a circular region C with coordinates (Sx, Sy) as the center and radius Sr as the radius;

[0024] Step 5.6: Obtain the cutting region Q, Q = CS;

[0025] Step 5.7: Perform a morphological closing operation on the cut region Q to obtain region Q';

[0026] Step 5.8: Calculate the minimum bounding rectangle for region Q' to obtain the minimum bounding rectangle R, the center point of the rectangle (Rx, Ry), the length L, the width W, and the horizontal offset angle θ of the rectangle;

[0027] Step 5.9: Obtain the distance H between the cut position and the film roller. Set the threshold between the cut position and the film roller to H0, where H0 is a set value. Determine the relationship between H and H0.

[0028] Furthermore, the formula for calculating H in step 5.9 is:

[0029] H=H1-H2-Gr=H1-cosc×L1-Gr (1)

[0030] In equation (1), H1 is the distance between the center of the film roller and the center point of the rectangle Q'. X represents the distance in the x-coordinate direction between the center of the thin film roller and the center point of the rectangle in region Q'; Y represents the distance in the y-coordinate direction between the center of the thin film roller and the center point of the rectangle in region Q'; H2 represents the portion H1 located within region Q'; and L1 is an auxiliary line passing through the center point of the rectangle in region Q', parallel to the length direction of the rectangle. c is the angle between L1 and H2, where

[0031]

[0032] In equation (3), a is the angle between the diagonal of the rectangle Q' and the length of the rectangle, b is the angle between H2 and the diagonal of the rectangle Q', and d is the angle between the line connecting the center of the film roller and the center point of the rectangle Q' and the horizontal plane; thus, equation (4) is obtained.

[0033]

[0034] In formula (4)

[0035] cosθ and sinθ are known values.

[0036] Based on equations (1) to (4), we obtain equation (5).

[0037]

[0038] In summary, the advantages of this invention are:

[0039] This invention uses a spacing calibration device to precisely control the film cutting thickness of the cutting device and achieve automatic film cutting. At the same time, it monitors the length of the cuts at both ends of the film to achieve automatic alignment, effectively improving the quality and efficiency of film cutting. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the roll film cutting machine of the present invention.

[0041] Figure 2 This is a schematic diagram of the present invention.

[0042] Figure 3 for Figure 2 Enlarged diagram of B in the diagram.

[0043] Figure 4 This is a schematic diagram of one end of the thin film of the present invention.

[0044] Figure 5 This is a schematic diagram of the other end of the thin film of the present invention.

[0045] Figure 6 This is a top view of the present invention.

[0046] Figure 7This is a flowchart of the image processing of the present invention. Detailed Implementation

[0047] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0048] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0049] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, lateral, longitudinal, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0050] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0051] Example 1:

[0052] like Figure 1 As shown, a roll film cutting machine includes a frame 1, a moving device 2, a cutting device 3, a spacing calibration device 4, and a control module. The moving device 2, the cutting device 3, and the spacing calibration device 4 are respectively connected to the control module. The moving device 2 includes a horizontal moving mechanism 21 and a vertical moving mechanism 22. The horizontal moving mechanism 21 and the spacing calibration device 4 are fixed on the frame 1. The cutting device 3 is fixed on the vertical moving mechanism 22. The frame 1 carries a film assembly 5. The cutting device 3 includes a cutting blade 32. The spacing calibration device 4 includes a camera 41 and an image processing module.

[0053] like Figure 1 As shown, the x-direction is set as the left-right direction, which is also the lateral direction of the transverse movement mechanism 21; the y-direction is set as the front-back direction, which is also the longitudinal direction of the longitudinal movement mechanism 22; and the z-direction is set as the up-down direction, which is also the disassembly and assembly direction of the thin film assembly 5.

[0054] The frame 1 includes a support 11, a first connecting frame 12 and a second connecting frame 13. The support 11 is provided in two sets, and the two sets of support 11 are symmetrically arranged. The first connecting frame 12 and the second connecting frame 13 are respectively located between the two sets of support 11 and are fixedly connected to the support 11.

[0055] The support 11 is provided with an upward-facing groove 111. The grooves 111 of the two sets of supports 11 are correspondingly arranged. The film assembly 5 includes a film roller 51 and a film 52. The film 52 to be cut is wound on the film roller 51. The two ends of the film roller 51 are respectively set in the groove 111. Preferably, the groove 111 is set as a semi-circular slot, and the two ends of the film roller 51 are set as cylindrical. The shapes of the film roller 51 and the groove 111 match to ensure the stability of the film assembly 5 during the cutting process.

[0056] To further secure the film assembly 5, the roll film cutting machine also includes a clamping mechanism. The clamping mechanism includes a clamping cylinder 61 and a clamping block 62. The clamping cylinder 61 is fixedly mounted on the bracket 11, and the output shaft of the clamping cylinder 61 is fixedly connected to the clamping block 62. The clamping cylinder 61 drives the clamping block 62 to move along the positive y direction to clamp the film roller 51. There are two sets of clamping mechanisms, which are located on two sets of brackets 11. They clamp both ends of the film roller 51 to clamp the film assembly 5 and ensure the stability of the film assembly 5 during the cutting process.

[0057] Preferably, the end face of the clamping block 62 facing the film roller 51 is set as an arc surface, which matches the arc shape of the outer surface of the film roller 51.

[0058] Preferably, the clamping block 62 is slidably connected to the bracket 11 to guide the movement of the clamping block 62 and prevent the clamping block 62 from shifting during operation.

[0059] The moving device 2 includes a transverse moving mechanism 21 and a longitudinal moving mechanism 22. The transverse moving mechanism 21 is fixed between two sets of supports 11, and the longitudinal moving mechanism 22 is fixed to the transverse moving mechanism 21. The transverse moving mechanism 21 drives the longitudinal moving mechanism 22 to move along the x-direction. The transverse moving mechanism 21 includes a transverse moving motor 211 and a transverse moving frame 212. The transverse moving frame 212 is distributed along the x-direction. Both ends of the transverse moving frame 212 are fixedly connected to the two sets of supports 11 respectively. A transverse moving screw (not shown in the figure) is rotatably installed inside the transverse moving frame 212. A transverse moving slider 213 is connected to the transverse moving screw. The transverse moving slider 213 is slidably connected to the transverse moving frame 212. The transverse moving motor 211 is fixed to any support 11. The transverse moving motor 211 is connected to any end of the transverse moving screw. When the transverse moving motor 211 is started, it drives the transverse moving screw to rotate. The rotation of the transverse moving screw drives the transverse moving slider 213 to move along the transverse moving frame 212.

[0060] In this embodiment, the longitudinal movement mechanism 22 has the same structure as the transverse movement mechanism 21. The longitudinal movement mechanism 22 includes a longitudinal movement motor 221 and a longitudinal movement frame 222. The longitudinal movement frame 222 is fixed to the transverse movement slider 213. When the transverse movement slider 213 moves along the transverse movement frame 212, it drives the longitudinal movement frame 222 to move synchronously.

[0061] The longitudinal moving frame 222 is distributed along the y-direction. A longitudinal moving screw (not shown in the figure) is rotatably installed inside the longitudinal moving frame 222. A cutting bracket 223 is connected to the longitudinal moving screw. The cutting bracket 223 is fixedly connected to the cutting device 3. The cutting bracket 223 is slidably connected to the longitudinal moving frame 222. The longitudinal moving motor 221 is fixedly installed on the longitudinal moving frame 222. The longitudinal moving motor 221 is connected to the longitudinal moving screw. When the longitudinal moving screw is started, it drives the longitudinal moving screw to rotate. The rotation of the longitudinal moving screw drives the cutting bracket 223 to move along the y-direction.

[0062] The cutting device 3 includes a cutting motor 31, which is fixed to the cutting bracket 223 via a cutting blade bracket. The output shaft of the cutting motor 31 is fixed with a cutting blade 32. A protective cover 33 is provided on the cutting blade bracket to protect the cutting blade 32.

[0063] The spacing calibration device 4 includes a camera 41 and an image processing module (not shown in the figure). Two sets of cameras 41 are set up, located at both ends of the film assembly 5. The images captured by the cameras 41 at both ends are processed by the image processing module to determine whether the cut lengths at both ends of the film are aligned. The longitudinal movement mechanism 22 is controlled by the control module to achieve alignment by stepping the cutting device 3. The camera 41 is fixed to the bracket 11 by the camera bracket 42. The image acquisition direction of the camera 41 faces the film assembly 5. The camera 41 is connected to the image processing module, which has a built-in image processing algorithm. The image processing module is connected to the control module. The transverse movement mechanism 21, the longitudinal movement mechanism 22, and the cutting device 3 are respectively connected to the control module. The camera 41 captures the image and transmits the captured image to the image processing module. The image processing module processes the received image and transmits the processing result to the control module. The control module controls the opening and closing of the transverse movement mechanism 21, the longitudinal movement mechanism 22, and the cutting device 3 according to the processing result.

[0064] The roll film cutting machine also includes traveling wheels 7, which are installed on the frame 1. The roll film cutting machine can be manually pushed or locked by the traveling wheels 7.

[0065] In this embodiment, the film assembly 5 is installed in the groove 111 of the bracket 11. The clamping cylinder 61 is activated, and the clamping block 62 clamps the film roller 51. The transverse mechanism 21 is activated, moving the longitudinal mechanism 22 to the first cutting position. The longitudinal mechanism 22 is activated, moving the cutting device 3 to the second cutting position, which is the position to be cut. At this time, the cutting device 3 is activated, the longitudinal mechanism 22 moves a set distance along the y-direction, and the transverse mechanism 21 moves along the x-direction to cut the film. The above steps are repeated. During this process, the spacing calibration device 4 detects the distance between the cut position of the cutting blade 32 and the film roller 51 in real time to prevent the cutting blade 32 from excessively touching the film roller 51 or the film thickness from being insufficient, which would lead to repeated cutting. This invention improves the precision of film cutting. When the distance between the cut position and the film roller 51 is within the threshold, it indicates that the film cutting is in place. At this time, the control module controls the cutting device 3 to shut down and controls the horizontal movement mechanism 21 and the vertical movement mechanism 22 to reset, preparing for the next film cutting. During the film cutting process, the images captured by the cameras 41 at both ends are processed by the image processing module to determine whether the cut lengths at both ends of the film are aligned. The control module then controls the vertical movement mechanism 22, which controls the cutting device 3 to step to achieve alignment. This application uses the spacing calibration device 4 to accurately control the film cutting thickness of the cutting device 3 and realize automatic film cutting. At the same time, it monitors the cut lengths at both ends of the film to achieve automatic alignment, effectively improving the quality and efficiency of film cutting.

[0066] In this embodiment, the first cutting position is located at both ends of the transverse frame 212, and the second cutting position, i.e., the position to be cut, is... Figure 1 Position A or position B in the diagram.

[0067] like Figure 2-7 As shown, this application also includes a method of using a roll film cutting machine, which, based on the aforementioned roll film cutting machine, includes the following steps:

[0068] Step 1: Initialize the roll film cutting machine and confirm the status of the moving device 2, cutting device 3, spacing calibration device 4, and control module;

[0069] Step 2: The film assembly 5 is installed on the frame 1, and the clamping mechanism secures the film assembly 5 to the frame 1;

[0070] Step 3: The transverse mechanism 21 moves the longitudinal mechanism 22 and the cutting device 3 installed on the longitudinal mechanism 22 to the first cutting position, and the longitudinal mechanism 22 is activated to move the cutting device 3 to the position to be cut;

[0071] Step 4: The cutting device 3 starts cutting the roll film along the axial direction of the film assembly 5;

[0072] Step 5: Camera 41 captures images and transmits them to the image processing module for processing;

[0073] Step 6: Determine whether the cut lengths at both ends of the film are aligned based on the image processing data from Step 5. If yes, proceed to Step 4. If no, the cutting device 3 stops cutting, the longitudinal movement mechanism 22 controls the cutting disc to step forward, and Step 5 is executed. Repeat this process multiple times to complete the alignment and cutting adjustment.

[0074] Step 7: Based on the image processing data from Step 5, determine whether the distance between the cut position and the film roller 51 is less than the threshold. If yes, the film roll is cut in place, the cutting device 3 stops running, the transverse mechanism 21, the longitudinal mechanism 22 and the cutting device 3 are reset, the clamping mechanism is started and reset, the film assembly 5 is removed from the frame 1 and placed in the storage area, the step ends, and one film roll is completed. If no, the longitudinal mechanism 22 will move the cutting sheet towards the film direction and execute Step 4.

[0075] Step 5, the image processing module processes the image, including the following steps:

[0076] To achieve better image processing results, the film roller 51 and film 52 have a large color difference. In this embodiment, the film is transparent and the film roller 51 is blue.

[0077] Step 5.1: Establish an image coordinate system, extract the thin film roller 51 region, and set the thin film roller 51 region as G;

[0078] Step 5.2: Based on G obtained in Step 5.1, obtain the edge of the thin film roller 51, and perform circle fitting to obtain the center coordinates (G) of the thin film roller 51. x G y ) and radius G r ;

[0079] Step 5.3: Extract the thin film region, and set the thin film region as S;

[0080] Step 5.4: Based on the S obtained in Step 5.3, obtain the edge of film 52, and perform circle fitting to obtain the center coordinates (S) of film 52. x and S y ) and radius S r , ;

[0081] Step 5.5: Obtain the coordinates (S) based on the data obtained in Step 5.4. x S y Let S be the center of the circle and let S be the radius of the circle. r A circular region C with radius C;

[0082] Step 5.6: Obtain the cutting region Q, Q = CS;

[0083] Step 5.7: Perform a morphological closing operation on the cut region Q to obtain region Q';

[0084] Step 5.8: Calculate the minimum bounding rectangle for region Q' to obtain the minimum bounding rectangle R and the center point of the rectangle (R). x R y The rectangle's length L, width W, and horizontal offset angle θ;

[0085] Step 5.9: Obtain the distance H between the cut position and the film roller 51. Set the threshold between the cut position and the film roller 51 to H0. H0 is a set value. Determine H and H0.

[0086] The formula for calculating H in step 5.9 is:

[0087] H = H1 - H2 - G r =H1-cosc×L1-G r (1)

[0088] In equation (1), H1 is the distance between the center of the thin film roller 51 and the center point of the rectangle Q'. X is the distance in the x-coordinate direction between the center of the thin film roller 51 and the center point of the rectangle Q'; Y is the distance in the y-coordinate direction between the center of the thin film roller 51 and the center point of the rectangle Q'; H2 is the portion H1 located within region Q'; L1 is an auxiliary line passing through the center point of the rectangle Q', and L1 is parallel to the length direction of the rectangle. c is the angle between L1 and H2, where

[0089]

[0090] In equation (3), a is the angle between the diagonal of the rectangle Q' and the length of the rectangle, b is the angle between H2 and the diagonal of the rectangle Q', and d is the angle between the line connecting the center of the film roller 51 and the center point of the rectangle Q' and the horizontal plane; thus, equation (4) is obtained.

[0091]

[0092] In formula (4)

[0093] cosθ and sinθ are known values.

[0094] Based on equations (1) to (4), we obtain equation (5).

[0095]

[0096] Step 6 involves determining whether the lengths of the cuts at both ends of the film are aligned based on the image processing data from step 5. This includes the following steps:

[0097] Step 6.1: Camera 41 captures an image of one end of the film, which is then processed by the image processing module to obtain the first cut length LA;

[0098] Step 6.2: Another camera 41 captures an image of the other end of the film, which is then processed by the image processing module to obtain the second cut length LB;

[0099] Step 6.3: Compare the magnitudes of LA and LB to obtain the minimum value Lmin.

[0100] Lmin = MIN(LA,LB);

[0101] Step 6.4: Calculate the tilt angle α between LA and LB.

[0102] Where LC is the absolute value of the difference between LA and LB, LC=|LA-LB|, LO is the length of the film 52. The smaller tanα is, the smaller the difference between LA and LB is, and the more aligned the lengths of the cuts at both ends are. Determine whether tanα is within the difference threshold z, where z is a set value. If yes, then determine that the lengths of the cuts at both ends of the film are aligned. If no, then determine that the lengths of the cuts at both ends of the film are not aligned, and proceed to step 6.5.

[0103] Step 6.5: At the Lmin end, the longitudinal movement mechanism 22 controls the cutting blade to step forward and then cuts. The cutting amount of a single step by the longitudinal movement mechanism 22 is AL. N is the number of times the cutting disc moves in the longitudinal movement mechanism 22. When LC is much greater than AL, the alignment and cutting adjustment operation is completed by repeating N times.

[0104] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A method of using a roll film cutter, the method comprising: The method comprises the following steps: Step 1: The roll film cutting machine is initialized to confirm the states of the moving device, the cutting device, the spacing calibration device and the control module; Step 2: The film assembly is installed on the rack, and the film assembly is fastened on the rack by the clamping mechanism; Step 3: The transverse moving mechanism moves the longitudinal moving mechanism and the cutting device installed on the longitudinal moving mechanism to the first cutting position, and the longitudinal moving mechanism is started to move the cutting device to the cutting position; Step 4: The cutting device is started to cut the roll film in the axial direction of the film assembly; Step 5: The camera captures an image, and the camera transmits the image to the image processing module for processing; Step 6: According to the image processing data of step 5, it is judged whether the lengths of the two ends of the film are aligned, if yes, step 4 is executed, if not, the cutting device stops cutting, the longitudinal moving mechanism controls the cutting piece to step, step 5 is executed, and the alignment cutting adjustment is completed after multiple cycles; Step 7: According to the image processing data of step 5, it is judged whether the spacing between the cutting position and the film roller is less than a threshold value, if yes, the roll film cutting is in place, the cutting device stops running, the transverse moving mechanism, the longitudinal moving mechanism and the cutting device are reset, the clamping mechanism is started to reset, the film assembly is separated from the rack and placed in the storage area, and the cutting of the roll film is ended once, if not, the longitudinal moving mechanism steps the cutting piece towards the film, and step 4 is executed; The image processing module in step 5 processes the image, which comprises the following steps: Step 5.1: An image coordinate system is established, and a film roller region is extracted, which is set as G; Step 5.2: Obtain the edge of the film roller according to G obtained in step 5.1, and perform a circle fitting to obtain the center coordinates (G x , G y ) and radius G r of the film roller; Step 5.3: A film region is extracted, which is set as S; Step 5.4: Obtain the film edge from S obtained in step 5.3, and perform a circle fitting to obtain the center coordinates (S x , y ) and radius S r ; Step 5.5: Obtain a circular region C with center at coordinates (S x , S y ) and radius S r , based on the data obtained in Step 5.4; Step 5.6: A cutting region Q is obtained, Q=C-S; Step 5.7: Morphological closing operation is performed on the cutting region Q to obtain a region Q'; Step 5.8: Calculate the minimum bounding rectangle for region Q', resulting in minimum bounding rectangle R, rectangle center point (R x , R y ), and the length L, width W, and horizontal offset angle Θ of the rectangle; Step 5.9: The spacing H between the cutting position and the film roller is obtained, the threshold value of the cutting position and the film roller is set as H0, H0 is a set value, and H and H0 are judged.

2. The use method of the roll film cutting machine according to claim 1, wherein: The calculation formula of H in step 5.9 is: H = H1- H2- G r = H1- cosc x L1- G r (1) In formula (1), H1 is the distance between the center of the film roller and the center point of the rectangle of the region Q', X is the distance between the center of the film roller and the x-coordinate direction of the center point of the rectangle of the region Q', Y is the distance between the center of the film roller and the y-coordinate direction of the center point of the rectangle of the region Q', H2 is the part H1 located in the region Q', L1 is the auxiliary line passing through the center point of the rectangle of the region Q', L1 is parallel to the length direction of the rectangle, c is the included angle between L1 and H2, wherein c=a-b=a-[(90°-d)-(90°-θ)]=a+d-θ (3) In formula (3), a is the included angle between the diagonal of the Q' rectangular region and the length of the rectangular region, b is the included angle between H2 and the diagonal of the Q' rectangular region, and d is the included angle between the line connecting the center of the film roller and the center point of the Q' rectangular region and the horizontal; formula (4) is obtained In formula (4) cos θ and sin θ are known values, According to formula (1)-(4), formula (5) is obtained 3. A roll film cutting machine made using the method of any of claims 1-2, wherein: The roll film cutting machine comprises a rack, a moving device, a cutting device, a spacing calibration device and a control module, the moving device, the cutting device and the spacing calibration device are connected with the control module, the moving device comprises a transverse moving mechanism and a longitudinal moving mechanism, the transverse moving mechanism and the spacing calibration device are fixedly arranged on the rack, the cutting device is fixedly arranged on the longitudinal moving mechanism, the rack bears a film assembly, the cutting device comprises a cutting piece, and the spacing calibration device comprises a camera and an image processing module.

4. A roll film cutter as claimed in claim 3, wherein: The rack comprises two supports, a first connecting rack and a second connecting rack, the two supports are symmetrically arranged, the first connecting rack and the second connecting rack are respectively arranged between the two supports and fixedly connected with the supports, the film assembly comprises a film roller and a film, the film to be cut is wound on the film roller, and the two ends of the film roller are arranged on the supports.

5. A roll film cutter as claimed in claim 4, wherein: The transverse movement mechanism is fixedly arranged between the two supports, the longitudinal movement mechanism is fixedly arranged on the transverse movement mechanism, the transverse movement mechanism comprises a transverse movement motor and a transverse movement rack, the two ends of the transverse movement rack are fixedly connected with the two supports, a transverse movement screw is rotatably arranged in the transverse movement rack, a transverse movement sliding block is connected to the transverse movement screw, the transverse movement sliding block is slidably connected with the transverse movement rack, and the transverse movement motor is fixedly arranged on any one of the supports and connected with any one end of the transverse movement screw.

6. A roll film cutter as claimed in claim 5 wherein: The longitudinal movement mechanism comprises a longitudinal movement motor and a longitudinal movement rack, the longitudinal movement rack is fixedly arranged on the transverse movement sliding block, a longitudinal movement screw is rotatably arranged in the longitudinal movement rack, a cutting support is connected to the longitudinal movement screw, the cutting support is fixedly connected with the cutting device, the cutting support is slidably connected with the longitudinal movement rack, the longitudinal movement motor is fixedly arranged on the longitudinal movement rack and connected with the longitudinal movement screw.

7. A roll film cutter as claimed in claim 6, wherein: The cutting device comprises a cutting motor, the cutting motor is fixedly arranged on the cutting support through a cutting blade support, a cutting blade is fixedly arranged on an output shaft of the cutting motor, and a protective cover is arranged on the cutting blade support.

8. A roll film cutter as defined in claim 4 wherein: The camera is arranged in two, and is arranged at the two ends of the film assembly, the camera is fixedly arranged on the support through a camera support, the image acquisition direction of the camera faces the film assembly, the camera is connected with an image processing module, the image processing module is provided with an image processing algorithm, the image processing module is connected with a control module, the transverse movement mechanism, the longitudinal movement mechanism and the cutting device are connected with the control module, the camera acquires images and transmits the acquired images to the image processing module, the image processing module processes the received images and transmits the processing results to the control module, and the control module controls the opening and closing of the transverse movement mechanism, the longitudinal movement mechanism and the cutting device according to the processing results.

9. A roll film cutter as defined in claim 3 wherein: Further comprising a walking wheel, the walking wheel is arranged on the rack.

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